relationship problem

my fiance has bipolar disorder & it gets pretty bad sometimes. Lately, we've been in an "argument" for about a month now. but by that I mean, he acts like he wants nothing to do with me he acts like he's mad but I have no idea what for.. he thinks it's okay to go riding around after work when I'm up waiting for him to get home. finally I told him I was leaving him & moving out. well. I did I moved in with my parents. but my fiance doesn't take it seriously. he actually thought I was joking until he saw my stuff packed. well now he's asking when I'll be home. & I do want to come home so badly but I want him to change his ways & be the person he normally is. ugh Idk what to do